/* ==========================================
   兔老板 · iPhone / 移动端适配
   主断点: 375px (iPhone SE/6/7/8), 390px (iPhone 12/13/14), 428px (iPhone Pro Max)
   次级断点: 768px (iPad mini)
   ========================================== */

/* ====== 基础排版缩放 ====== */
@media (max-width: 480px) {
  /* 大标题缩放 */
  .hero-center h1 {
    font-size: 32px !important;
    line-height: 1.15 !important;
  }
  .hero-steps {
    --step-pad: 14px;
    --step-badge: 30px;
    margin-bottom: 26px;
  }
  .hero-step { gap: 12px; }
  .step-title { font-size: 15px; }
  .step-desc { font-size: 14px; line-height: 1.6; }

  .section-title h2 {
    font-size: 26px !important;
  }
  .section-title p {
    font-size: 14px !important;
    padding: 0 8px;
  }

  /* 段落 */
  p {
    font-size: 14px;
    line-height: 1.7;
  }

  /* 容器内边距收紧 */
  .container {
    padding: 0 16px;
  }
  .section {
    padding: 48px 0;
  }

  /* hero 间距 */
  .hero-center {
    padding: 48px 0 40px;
  }

  /* 防止横向溢出 */
  body {
    overflow-x: hidden;
  }
  img, table, pre, code {
    max-width: 100%;
  }
}

/* ====== 导航栏移动端优化 ====== */
@media (max-width: 720px) {
  .nav-inner {
    padding: 10px 0;
  }
  .brand {
    font-size: 16px;
  }
  .brand-logo {
    width: 28px;
    height: 28px;
  }

  /* 顶部 CTA 按钮缩小 */
  .nav-cta {
    padding: 7px 12px;
    font-size: 12px;
    border-radius: 8px;
  }

  /* 语言切换缩小 */
  .lang-switch button {
    font-size: 11px;
    padding: 4px 8px;
  }

  /* 公告栏 */
  .announcement {
    font-size: 12px;
    padding: 8px 0;
  }
  .announcement-inner {
    gap: 6px;
  }
}

/* ====== 免费资料卡片 ====== */
@media (max-width: 480px) {
  .freebie-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .value-card {
    padding: 16px;
  }
  .value-card h3 {
    font-size: 13px;
  }
  .value-card p {
    font-size: 11px;
    line-height: 1.5;
  }
  .value-card .value-icon {
    font-size: 22px;
    margin-bottom: 8px;
  }
}

/* ====== 课程卡片 ====== */
@media (max-width: 480px) {
  .featured-courses {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .fcard-cover {
    height: 120px;
  }
  .fcard-emoji {
    font-size: 48px;
  }
  .fcard-body {
    padding: 16px;
  }
  .fcard h3 {
    font-size: 17px;
  }
  .fcard-desc {
    font-size: 13px;
  }
  .fcard-link {
    font-size: 13px;
  }
  .fcard-tags span {
    font-size: 10px;
    padding: 2px 7px;
  }
}

/* ====== 论文时间轴 ====== */
@media (max-width: 480px) {
  .paper-timeline {
    gap: 4px;
  }
  .paper-node {
    min-width: 80px;
    padding: 10px 6px;
    font-size: 11px;
  }
  .paper-node strong {
    font-size: 13px;
    margin-top: 2px;
  }
  .paper-card h3 {
    font-size: 20px;
  }
  .paper-card p {
    font-size: 13px;
  }
}


/* ====== 知乎/干货卡片 ====== */
@media (max-width: 480px) {
  .zhihu-cards {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .zcard {
    padding: 20px;
  }
  .zcard h3 {
    font-size: 16px;
  }
  .zcard p {
    font-size: 13px;
  }
}

/* ====== 对比表 ====== */
@media (max-width: 600px) {
  .compare th, .compare td {
    padding: 8px 6px;
    font-size: 11px;
  }
  .compare th {
    font-size: 10px;
  }
}

/* ====== 讲师卡片 ====== */
@media (max-width: 480px) {
  .mentor {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 24px;
    gap: 20px;
  }
  .avatar {
    width: 120px;
    height: 120px;
    margin: 0 auto;
    font-size: 52px;
  }
  .mentor h3 {
    font-size: 22px;
  }
  .mentor .title {
    font-size: 13px;
  }
  .mentor p {
    font-size: 13px;
  }
  .mentor .creds {
    justify-content: center;
    gap: 6px;
  }
  .mentor .cred {
    font-size: 11px;
    padding: 4px 10px;
  }
}

/* ====== 免费→私信 的桥 / 首页 FAQ（2026-09-17）====== */
@media (max-width: 480px) {
  .free-bridge {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
    padding: 16px;
  }
  .free-bridge-cta { text-align: center; }
  .faq-item { padding: 0 14px; }
  .faq-item summary { font-size: 14.5px; }
}

/* ====== FAQ ====== */
@media (max-width: 480px) {
  .faq-q {
    font-size: 14px;
    padding: 14px 16px;
  }
  .faq-a-inner {
    font-size: 13px;
    padding: 0 16px 16px;
  }
}

/* ====== CTA 区域 ====== */
@media (max-width: 480px) {
  .cta-final {
    padding: 36px 20px;
  }
  .cta-final h2 {
    font-size: 24px;
  }
  .cta-final p {
    font-size: 14px;
  }

  /* CTA 按钮行 */
  .hero-cta-row {
    flex-direction: column;
    gap: 10px;
    align-items: center;
  }
  .hero-cta-row .btn-primary,
  .hero-cta-row .btn-secondary {
    width: 100%;
    justify-content: center;
    text-align: center;
  }
  .btn-primary, .btn-secondary {
    padding: 12px 18px;
    font-size: 14px;
  }
}

/* ====== 表单和联系 ====== */
@media (max-width: 480px) {
  .contact-form-wrap {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .form-group input,
  .form-group textarea,
  .form-group select {
    font-size: 16px; /* 防止 iOS 缩放 */
    padding: 12px 14px;
  }
}

/* ====== 页脚 ====== */
@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    text-align: center;
  }
  .footer-right {
    justify-content: center;
    gap: 12px 16px;
  }
  .footer {
    padding: 24px 0;
    font-size: 12px;
  }
}

/* ====== 底部导航 ====== */
@media (max-width: 480px) {
  .bottom-nav {
    font-size: 11px;
    padding: 8px 0 calc(8px + env(safe-area-inset-bottom));
  }
  .bottom-nav a {
    padding: 2px 4px;
    gap: 1px;
  }
}

/* ====== 定价页 ====== */
@media (max-width: 480px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .pcard {
    padding: 20px;
  }
  .bundle-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .bundle-price .now {
    font-size: 32px;
  }
}

/* ====== 课程详情页 ====== */
@media (max-width: 480px) {
  .course-hero h1 {
    font-size: 24px !important;
  }
  .course-hero .summary {
    font-size: 14px;
  }
  .course-hero .meta-row {
    font-size: 12px;
    gap: 12px;
  }
  .buy-card {
    position: static;
  }
  .buy-card .price-now {
    font-size: 28px;
  }
  .info-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .info-block {
    padding: 18px;
  }
  .module-header {
    padding: 14px 16px;
  }
  .module-title {
    font-size: 14px;
  }
  .lesson-list li {
    font-size: 13px;
    flex-direction: column;
    gap: 4px;
  }
  .mentor-mini {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .mentor-mini .ava {
    margin: 0 auto;
    width: 80px;
    height: 80px;
  }
}

/* ====== 触摸优化 ====== */
@media (max-width: 720px) {
  /* 增大可点击区域 */
  a, button, .btn-primary, .btn-secondary,
  .faq-q, .module-header, .tab, .paper-node {
    min-height: 44px; /* Apple HIG 推荐最小触摸目标 */
  }

  /* 链接间距 */
  .nav-links a {
    padding: 8px 0;
  }

  /* 模态框 */
  .modal-box {
    width: 95%;
    padding: 24px;
  }

  /* 防止双击缩放 */
  button, a, [role="button"] {
    touch-action: manipulation;
  }
}

/* ====== 横向滚动容器 ====== */
@media (max-width: 480px) {
  /* 对比表可横滑 */
  .compare-wrap {
    -webkit-overflow-scrolling: touch;
  }
  /* 论文时间轴可横滑 */
  .paper-timeline {
    -webkit-overflow-scrolling: touch;
  }
}

/* ====== iPhone 特殊优化 ====== */
/* 安全区域 */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  body {
    padding-bottom: env(safe-area-inset-bottom);
  }
}

/* 刘海屏适配 */
@supports (padding-left: env(safe-area-inset-left)) {
  .container {
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
  }
}

/* 禁用 iOS 的文本大小自动调整 */
html {
  -webkit-text-size-adjust: 100%;
}

/* 修复 iOS input 阴影 */
input, textarea, select {
  -webkit-appearance: none;
  border-radius: 0;
}